“Russia was responsible for the 1st world war. They were the first power to throw their weight around.”
You, sir, have been duped by Germany. Just so happens that, according to diplomatic conventions, throwing your weight around and mobilizing for war are not themselves acts of war. They never had been considered such, except suddenly by Germany in 1914. I wonder why?
Germany deliberately built their system around being able to mobilize in the midst of fighting, whereas Russia and France had to mobolize first, for weeks, before they had stategic options. This allowed Germany to wait until after its enemies mobilized to invade them, thus plausibly blaming them for starting it. Well, plausibly to people who nowadays don’t realize mobilizing for war and fighting a war aren’t the same thing. But they didn’t fool everyone way back when.
By the way, if Russia started it, why did Germany invade Belgium? What does Belgium have to do with Russia? What does Germany and Russia not being allies anymore have anything to do with Germany trying to conquer France?
“whereas Russia and France had to mobolize first”
So you admit that Russia AND France mobolized first? Germany fought back in self-defense. Do you think that if she were on the offensive that they would choose to fight a two front war? Hardly.
If the war was started with Germany, they would have fought on only the eastern or the western front. Instead, because Russia declared war on them, they were forced to defend on both. Defended so well that, as you said, they never fought on German soil in the west.